160 NINETPiEN'TH REPORT. 



Pht/sariim nefroideum Rost. 



Growing in large colonies on old logs. This was probably the most 

 abundant and variable of the species of Physarum detected. My 

 material includes the forms considered P. connexum and P. 

 leucophaenm by Morgan. 



Physarum glohuliferum (Bull.) Pers. ^ 



On old logs. 



Physarum lencopus Link. 



This seems to have been detected in few localities. My specimens were 

 found growing on old leaves. The snow white stipe gives it much 

 the appearance of Didymium squamulosum. 



Physarum rufipes (A. & S.) Morgan. 

 On old logs. 



Physarum flavicomum Berk. 

 Found once on old logs. 



Physarum lateritium (B. & Br.) Rost. 

 Found only once. 



Tilmadoche polycephala (Schw.) Macbr. 

 In large colonies on old logs. Not rare. 



Tilmadoche alba (Bull.) ]\lacbr. 

 On old logs. Common. 



Tilmadoche viridis (Bull.) Saccardo. 

 Common and very variable in color. 



7'ilmadoclie compacta Wingate. 

 On old logs. 



Physarella obl'onga (B. & C. ) Morgan. 



In large colonies on logs. '' 



Craterium aureum (Schum.) Rost. 



The sporangium in my specimens was pyriform and bright yellow. At 

 maturity it breaks in such a way as to leave a distinct cup, but one 

 of more irregular sliape than is characteristic of the other species 

 of this genus. 



Craterium leucocepludum (Pirs.) Ditmar. 



This species was by far the most abundant of the genus. The closely 

 related species C. minimum B. & C. which is the characteristic species 

 of northern Ohio was not observed. The brown sporangia, and pure 

 white, irregularly circumcissile cap distinguish it. 



Craterium minutum (Leers) Fries. 

 On old leaves. Common. 



